Explosion-Proof Switch and Explosion-Proof Electrical Device

The invention relates to the technical field of explosion-proof electrical devices, in particular to an explosion-proof switch and an explosion-proof electrical device.

In the related art, explosion-proof electrical devices (such as lamps and instruments) are controlled to be turned on and off in use by means of a button switch, which is generally not resistant to impacts and explosions. To guarantee the explosion resistance of an explosion-proof electrical device, the explosion-proof electrical device is provided with a receiving cavity and a cover plate, the button switch is mounted in the receiving cavity and covered with the cover plate. However, such an arrangement will lead to complex use of the button switch and the explosion-proof electrical device.

The technical issue to be settled by the invention is to provide an explosion-proof switch and an explosion-proof electrical device to solve the problem that button switches in the related art are not resistant to impacts and explosions.

a first protective shell, provided with a first receiving cavity; a switch element, arranged in the first protective shell and received in the first receiving cavity; a second protective shell, arranged at an end of the first protective shell, located outside the first protective shell and provided with a second receiving cavity, the switch element being received in the second receiving cavity; and a button, slidably assembled in the second protective shell and received in the second receiving cavity, the button being able to slide to be in contact with or separated from the switch element to turn on or off the switch element. To settle the above technical issue, in a first aspect, the invention provides an explosion-proof switch, comprising:

Optionally, a first connecting structure is arranged on an inner wall of the first receiving cavity, a second connecting structure is arranged on the switch element, and the first connecting structure and the second connecting structure are connected.

Optionally, the first connecting structure and the second connecting structure are connected threadedly.

Optionally, a first stop protrusion is arranged on an outer side of the switch element and abuts against an end of the first protective shell.

Optionally, the first protective shell is provided with a third connecting structure, a fourth connecting structure is arranged on an inner wall of the second receiving cavity, and the third connecting structure and the fourth connecting structure are connected.

Optionally, the third connecting structure and the fourth connecting structure are connected threadedly.

Optionally, a second stop protrusion is arranged on the inner wall of the second receiving cavity and abuts against an end, away from the first protective shell, of the switch element.

Optionally, the second receiving cavity penetrates through an end surface of the second protective shell to form a receding hole, and the button penetrates into the receding hole and is light-transmitting.

wherein, wherein, when the button slides to be in contact with or separated from the switch element, the fourth step protrusion is spaced apart from or abuts against the third stop protrusion. Optionally, an inner wall of the receding hole protrudes in a radial direction to form a third stop protrusion, and a fourth stop protrusion is arranged on an outer side of the button and received in the second receiving cavity;

In a second aspect, the invention provides an explosion-proof electrical device, comprising the explosion-proof switch and a device body, wherein the explosion-proof switch is arranged on device body and electrically connected to the device body.

Compared with the prior art, the explosion-proof electrical switch and the explosion-proof electrical device have the following beneficial effects: the switch element is arranged in the first protective shell and the second protective shell and the button is arranged in the second protective shell, such that the switch element and the button can be wrapped and protected by the protective shells to suffer from small impacts when the explosion-proof switch is impacted by energy, and the explosion-proof switch can resist impacts and explosions and does not need to be subjected to explosion-proof treatment when mounted on the device body of the explosion-proof electrical device; and when the explosion-proof switch is operated, users just need to press the button and do not need to perform other operations, such that the explosion-proof switch and the explosion-proof electrical device can be used together more easily.

1 11 111 112 113 12 121 2 21 22 23 3 31 32 33 34 35 4 41 5 6 7 8 9 10 40 Reference signs in the FIGS.:, first protective shell;, main portion;, first receiving cavity;, first connecting structure;, third connecting structure;, connecting portion;, cable hole;, switch element;, first stop protrusion;, pin;, second connecting structure;, second protective shell;, second receiving cavity;, second stop protrusion;, receding hole;, third stop protrusion;, fourth connecting structure;, button;, fourth stop protrusion;, first sealing element;, lead cable;, second sealing element;, third sealing element;, first mounting structure;, first flame-retardant element;, gasket.

The embodiments of the invention are described in detail below, and examples of the embodiments are illustrated in the accompanying drawings, in which identical or similar reference signs indicate identical or similar elements or elements with identical or similar functions. The embodiments described below with reference to the accompanying drawings are merely illustrative ones used for explaining the invention and should not be construed as limitations of the invention. All other embodiments obtained by those ordinarily skilled in the art based on the following ones without creative labor should also fall within the protection scope of the invention.

In the description of the invention, it should be understood that terms such as “central”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “anticlockwise”, “axial”, “circumferential” and “radial” are used for indicating directional or positional relationships based on the accompanying drawings merely for the purpose of facilitating and simplifying the description of the invention, do not indicate or imply that devices or elements referred to must be in a specific direction or be configured and operated in a specific direction, and thus should not be construed as limitations of the invention.

In addition, terms “first” and “second” are merely for the purpose of description and should not be construed as indicating or implying relative importance or the number of technical features referred to. Therefore, a feature defined by “first” or “second” may explicitly or implicitly indicate the inclusion of one or more said features. In the description of the invention, “multiple” and “a plurality of” means two or more, unless otherwise expressly defined.

One embodiment of the invention provides an explosion-proof electrical device, comprising an explosion-proof switch and a device body, wherein the explosion-proof switch is arranged on the device body and electrically connected to the device body to control the explosion-proof electrical device to be turned on and off. In some specific examples, the explosion-proof electrical device may be an explosion-proof lamp, an explosion-proof instrument, an explosion-proof motor or the like.

1 4 FIGS.- 1 2 3 4 1 111 2 1 111 3 1 1 31 2 31 4 3 31 4 2 2 Referring to, the explosion-proof switch comprises a first protective shell, a switch element, a second protective shelland a button. The first protective shellis provided with a first receiving cavity, the switch elementis arranged in the first protective shelland received in the first receiving cavity, the second protective shellis arranged at one end of the first protective shell, located outside the first protective shelland provided with a second receiving cavity, the switch elementis received in the second receiving cavity, the buttonis slidably assembled in the second protective shelland received in the second receiving cavity, and the buttonis able to slide to be in contact with or separated from the switch elementto turn on or off the switch element.

2 1 3 4 3 2 4 4 The switch elementis arranged in the first protective shelland the second protective shelland the buttonis arranged in the second protective shell, such that the switch elementand the buttoncan be wrapped and protected by the protective shells to suffer from small impacts when the explosion-proof switch is impacted by energy, and the explosion-proof switch can resist impacts and explosions and does not need to be subjected to explosion-proof treatment when mounted on the device body of the explosion-proof electrical device; and when the explosion-proof switch is operated, users just need to press the buttonand do not need to perform other operations, such that the explosion-proof switch and the explosion-proof electrical device can be used together more easily.

4 2 2 4 3 4 4 2 2 4 3 4 3 4 4 It should be understood that when the buttonslides to be separated from the switch element, an end, away from the switch element, of the buttonstretches out of an end surface of the second protective shell, such that users can press the buttoneasily. When the buttonslides to be in contact with the switch element, the end, away from the switch element, of the buttonis flush with the end surface of the second protective shell. Wherein, when the explosion-proof switch is impacted by energy, the buttonwill move to be flush with the end surface of the second protective shellunder pressure, and at this moment, only one end of the buttonis exposed, such that impacts suffered by the buttonare further reduced.

1 2 3 4 FIGS.,,and 1 3 111 31 2 4 2 111 4 31 1 3 1 3 Referring to, in some embodiments, the first protective shelland the second protective shellare both cylindrical, and the length of the first receiving cavityand the length of the second receiving cavityextend in an axial direction; and the switch elementand the buttonare both columnar, the length of the switch elementextends in a length direction of the first receiving cavity, and the buttonslides in a length direction of the second receiving cavity. The first protective shelland the second protective shellare both metal parts, for example, the first protective shelland the second protective shellmay be made from stainless steel, nickel-plated copper or other materials.

2 4 FIGS.and 112 111 23 2 112 23 2 1 112 23 2 1 112 111 23 2 Referring to, a first connecting structureis arranged on an inner wall of the first receiving cavity, a second connecting structureis arranged on the switch element, and the first connecting structureand the second connecting structureare connected to fix the switch elementin the first protective shell. In one specific example, the first connecting structureand the second connecting structureare connected threadedly, such that the switch elementcan be easily fixed to the first protective shell; wherein, the first connecting structuremay be threads arranged on the inner wall of the first receiving cavity, and the second connecting structuremay be threads arranged on the outer side of the switch element.

2 4 FIGS.and 21 2 1 2 2 1 21 111 2 111 1 21 2 21 111 21 1 2 1 21 1 2 1 Referring to, a first stop protrusionis arranged on the outer side of the switch elementand abuts against an end of the first protective shellto prevent the switch elementfrom further moving downwards in the process of assembling the switch elementon the first protective shell, and the first stop protrusionis able to preliminarily seal the first receiving cavity. Wherein, the number of the threads on the outer side of the switch elementis greater than the number of the threads on the inner wall of the first receiving cavity, such that the machining difficulty of the first protective shellcan be lowered; the first stop protrusionis circular and is disposed around an end of the outer side of the switch element, and the outer diameter of the first stop protrusionis greater than the diameter of the first receiving cavityto ensure that the first stop protrusioncan be in contact with the end of the first protective shell. It can be understood that in the process of screwing and threadedly connecting the switch elementto the first protective shell, when the first stop protrusionabuts against the end of the first protective shell, the switch elementis screwed in position on the first protective shell.

112 23 112 23 112 111 23 2 2 1 It should be noted that in some other embodiments, the first connecting structuremay be inserted into or clamped or buckled on the second connecting structure. For example, when the first connecting structureis inserted into the second connecting structure, the first connecting structuremay be an insertion pillar arranged on the inner wall of the first receiving cavity, the second connecting structuremay be an insertion hole formed in the switch element, and the insertion pillar is inserted into the insertion hole and is in interference fit with the insertion hole to fix the switch elementto the first protective shell.

2 4 FIGS.and 1 113 31 35 113 35 3 1 113 35 3 1 113 1 35 31 Referring to, the first protective shellis provided with a third connecting structure, an inner wall of the second receiving cavityis provided with a fourth connecting structure, and the third connecting structureand the fourth connecting structureare connected to fix the second protective shellto the first protective shell. In one specific example, the third connecting structureand the fourth connecting structureare connected threadedly, such that the second protective shelland the first protective shellcan be fixed together easily; wherein, the third connecting structuremay be threads arranged on the outer side of the first protective shell, and the fourth connecting structuremay be threads arranged on the inner wall of the second receiving cavity.

2 4 FIGS.and 32 31 1 2 3 3 1 32 31 21 1 32 32 1 21 2 1 1 21 21 32 1 3 32 21 2 1 Referring to, a second stop protrusionis arranged on the inner wall of the second receiving cavityand abuts against an end, away from the first protective shell, of the switch elementto prevent the second protective shellfrom further moving downwards in the process of assembling the second protective shellon the first protective shell. Wherein, the second stop protrusionis spaced apart from the threads on the second receiving cavity, the first stop protrusionis arranged between the first protective shelland the second stop protrusion, and the second stop protrusionabuts against a side, away from the first protective shell, of the first stop protrusionto prevent the switch elementfrom moving upwards; in addition, a conical surface is arranged on a side, close to the first protective shell, of the second stop protrusion, and a conical surface is arranged on a side, away from the first protective shell, of the first stop protrusion, such that the first stop protrusionand the second stop protrusioncan come in contact with each other easily. It can be understood that in the process of screwing and threadedly connecting the first protective shelland the second protective shell, when the second stop protrusionabuts against the first stop protrusion, the switch elementis screwed in position on the first protective shell.

3 2 32 21 2 1 3 It should be understood that the second protective shellmay be a locking nut corresponding to the switch element, and the second stop protrusionabuts against the first stop protrusion, such that the switch elementcan be locked and fixed to the first protective shellby means of the second protective shell.

113 35 113 35 113 1 35 31 1 3 It should be noted that in some other embodiments, the third connecting structuremay be inserted into or clamped or buckled on the fourth connecting structure. For example, when the third connecting structureis clamped on the fourth connecting structure, the third connecting structuremay be a clamping groove formed in the outer side of the first protective shell, the fourth connecting structuremay be a clamping portion arranged on the inner wall of the second receiving cavity, and the clamping protrusion is clamped in the clamping groove to fix the first protective shelland the second protective shelltogether.

2 FIG. 4 FIG. 31 3 33 4 33 2 3 33 4 4 4 4 4 Referring toand, the second receiving cavitypenetrates through an end surface of the second protective shellfrom a receding hole, and the buttonpenetrates through the receding holeto ensure that the switch elementcan be exposed out of the surface of the second protective shellvia the receding hole, such that the buttoncan be pressed easily; the buttonis light-transmitting and can transmit light in different colors to the outside to display the state of the explosion-proof electrical device, for example, when the buttontransmits red light to the outside, it indicates that the explosion-proof electrical device is in a fault state; when the buttontransmits green light to the outside, it indicates that the explosion-proof electrical device is in a normal operation state; wherein, the buttonmay be made from a transparent acrylic material.

2 4 FIGS.and 33 34 41 4 41 31 41 3 4 2 41 34 34 4 3 Referring to, an inner wall of the receding holeprotrudes in the radial direction to form a third stop protrusion, a fourth stop protrusionis arranged on an outer side of the button, and the fourth stop protrusionis received in the second receiving cavity, and the fourth stop protrusionis slidably assembled in the second protective shell; wherein, when the buttonslides to be in contact or separated from the switch element, the fourth stop protrusionis spaced apart from the third stop protrusionor abuts against the third stop protrusionto prevent the buttonfrom being separated from the second protective shell.

34 33 41 4 40 4 34 41 34 41 40 As actually needed, the third stop protrusionsurrounds the receding hole, the fourth stop protrusionmay be circular and disposed around the outer side of the button, a gasketis also disposed around the outer side of the buttonand arranged between the third stop protrusionand the fourth stop protrusion, such that collisions between the third stop protrusionand the fourth stop protrusioncan be reduced by the gasket.

2 4 FIGS.and 5 6 7 1 121 111 5 2 2 111 6 2 6 121 1 7 121 121 6 Referring to, the explosion-proof switch further comprises a first sealing element, a lead cableand a second sealing element. The first protective shellis further provided with a cable holeconnected to the first receiving cavity, the first sealing elementis disposed around the outer side of the switch elementand is in seal contact with the switch elementand the inner wall of the first receiving cavity; one end of the lead cableis connected to the switch element, and the other end of the lead cablepenetrates through the cable holeand stretches out of the first protective shell; and the second sealing elementis arranged in the cable holeand is in seal contact with an inner wall of the cable holeand the lead cable.

5 2 111 2 1 7 121 6 6 1 The first sealing elementis in seal contact with the switch elementand the inner wall of the first receiving cavityto seal an assembly clearance between the switch elementand the first protective shell, and the second sealing elementis in seal contact with the inner wall of the cable holeand the lead cableto seal an assembly clearance between the lead cableand the first protective shell, such that the sealing performance of the explosion-proof switch is improved, and rainwater and other flammable and explosive fluids in the external environment are prevented from entering the explosion-proof electrical device via the assembly clearances of the explosion-proof switch, thus avoiding a short circuit or an explosion.

2 4 FIGS.and 5 6 21 5 21 1 5 Referring to, the first sealing elementis arranged on a side, close to the lead cable, of the first stop protrusion, such that the first sealing elementcan seal an assembly clearance between the first stop protrusionand the first protective shellto guarantee the sealing performance. Wherein, the first sealing elementmay be a sealing ring.

7 121 6 121 121 7 6 1 121 121 121 In some embodiments, the second sealing elementis filled in the cable hole. Specifically, after the lead cablepenetrates through the cable hole, a sealant is filled in the cable holeto form the second sealing element, such that the sealing performance between the lead cableand the first protective shellis good. Wherein, the sealant may be a polyurethane sealant, a neoprene sealant, an epoxy resin sealant, or the like; the diameter of the cable holeis 10 mm-15 mm, such as 10 mm, 11 mm, 12 mm, 13 mm, 14 mm or 15 mm; and the length of the cable holeis 20 mm-25 mm, such as 20 mm, 21 mm, 22 mm, 23 mm, 24 mm or 25 mm, thus ensuring that a sufficient amount of the sealant can be received in the cable hole.

121 7 7 6 7 7 7 121 121 In some other embodiments, a circular mounting groove is formed in the inner wall of the cable hole, and the second sealing elementis arranged in the mounting groove. Specifically, the second sealing elementis mounted in the mounting groove first, and then the lead cablepenetrates through the second sealing element, such that the second sealing elementcan be assembled easily. Wherein, the second sealing elementmay be a sealing ring, multiple mounting grooves and multiple sealing rings may be arranged in the cable hole, the multiple mounting grooves are distributed at intervals in a length direction of the cable hole, and the multiple sealing rings are mounted in the multiple mounting grooves in one-to-one correspondence.

3 4 FIGS.and 1 11 12 11 111 12 121 121 111 11 12 12 9 8 12 9 12 8 12 Referring to, the first protective shellcomprises a main portionand a connecting portion. The main portionis provided with the first receiving cavity, the connecting portionis provided with the cable hole, and the diameter of the cable holeis less than that of the first receiving cavity, such that a step structure is formed between the main portionand the connecting portionto facilitate the connection between the connecting portionand the device body of the explosion-proof electrical device. A first mounting structureand a third sealing elementare arranged on an outer side of the connecting portion, and the first mounting structureis used for fixing the connecting portionto the device body of the explosion-proof electrical device so as to mount the explosion-proof switch on the device body of the explosion-proof electrical device. The third sealing elementis disposed around the outer side of the connecting portionand is in seal contact with the device body of the explosion-proof electrical device, thus guaranteeing the sealing performance between the explosion-proof switch and the device body of the explosion-proof electrical device.

3 4 FIGS.and 12 9 12 11 12 Referring to, in some embodiments, threads are arranged on the outer side of the connecting portion, the first mounting structuremay be a locking nut, and the locking nut is screwed on the outer side of the connecting portion, abuts against the device body, and locks and fixes the device body to the step structure between the main portionand the connecting portion.

12 1 It should be noted that by locking and fixing the connecting portionof the first protection shellto the device body of the explosion-proof electrical device, the whole explosion-proof switch protrudes out with respect to an outer surface of the device body and thus can be locked externally.

3 4 FIGS.and 10 10 12 8 10 12 10 10 Referring to, the explosion-proof switch further comprises a first flame-retardant element, the first flame-retardant elementis disposed around the outer side of the connecting portion, the third sealing elementis arranged between the first flame-retardant elementand the connecting portion, and the first flame-retardant elementis in contact with the device body of the explosion-proof electrical device to prevent combustion caused by a flame between the explosion-proof switch and the device body. Wherein, the first flame-retardant elementmay be made from flame-retardant silicone rubber.

12 12 9 12 In some other embodiments, the connecting portionmay be clamped or buckled on the device body or connected to the device body in other ways. For example, when the connecting portionis clamped on the device body, the first mounting structuremay be a clamping portion arranged on the outer side of the connecting portion, a clamping hole is formed in the device body, and the clamping portion is clamped in the clamping hole to mount the explosion-proof switch on the device body of the explosion-proof electrical device.

1 2 FIGS.and 20 3 3 3 3 20 3 3 Referring to, in some embodiments, a second mounting structureis arranged on an outer side of the second protective shelland used for fixing the second protective shellto the device body of the explosion-proof electrical device so as to mount the explosion-proof switch on the device body of the explosion-proof electrical device. A step structure is arranged on the outer side of the second protective shell, threads are arranged on the outer side of the second protective shell, the second mounting structuremay be a locking nut, and the locking nut is screwed on the outer side of the second protective shell, abuts against the device body, and locks and fixes the device body to the step structure of the second protective shell.

3 It should be noted that by locking and fixing the second protective shellto the device body of the explosion-proof electrical device, the whole explosion-proof switch is received in the device body and thus can be locked internally.

1 2 FIGS.and 30 30 3 30 Referring to, the explosion-proof switch further comprises a second flame-retardant element, and the second flame-retardant elementis disposed around the outer side of the second protective shelland is in contact with the device body of the explosion-proof electrical device to prevent combustion caused by a flame between the explosion-proof switch and the device body. Wherein, the second flame-retardant elementmay be made from flame-retardant rubber.

3 3 20 3 In some other embodiments, the second protective shellmay be clamped or buckled on the device body or connected to the device body in other ways. For example, when the second protective shellis clamped on the device body, the second mounting structuremay be a clamping portion arranged on the outer side of the second protective shell, a clamping hole is formed in the device body, and the clamping portion is clamped in the clamping hole to mount the explosion-proof switch on the device body of the explosion-proof electrical device.

The above embodiments are merely preferred ones of the invention and are not used for limiting the invention, and any amendments, equivalent substitutions and improvements made based on the spirit and principle of the invention should also fall within the protection scope of the invention.